Meaning of letters and symbols:


K

is the number of a loan

K′

is the number of a repayment or a payment of charges

^{A}K

is the amount of loan number K

^{A}′K′

is the amount of repayment number K′


represents a sum

m

is the number of the last loan

m′

is the number of the last repayment or payment of charges

^{t}K

is the interval, expressed in years and fractions of a year, between the date of loan No. 1 and those of subsequent loans Nos. 2 to m′

^{t}K′

is the interval expressed in years and fractions of a year between the date of loan No. 1 and those of repayments or payments of charges Nos. 1 to m1

i

is the percentage rate that can be calculated (either by algebra, by successive approximations, or by a computer programme) where the other terms in the equation are known from the contract or otherwise.
